export default function () {
  let s = []
  let hexDigits = '0123456789abcdef'
  for (let i = 0; i < 32; i++) {
    let start = Math.floor(Math.random() * 0x10)
    s[i] = hexDigits.substring(start, start + 1)
  }

  s[14] = '4' // bits 12-15 of the time_hi_and_version field to 0010

  let start = (s[19] & 0x3) | 0x8
  s[19] = hexDigits.substring(start, start + 1) // bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23]
  let uuid = s.join('')
  return uuid
}
